
<template>
    <div class="app_container">
        <!-- Header 区域 -->
        <mt-header fixed title="z&j home">
            <router-link to="/" slot="left" v-show="flag"> 
                <mt-button icon="back" @click="back">返回</mt-button>                
            </router-link>
        </mt-header>


        <!-- 路由变化区域 -->
        <transition>
            <router-view></router-view>
        </transition>        


        <!-- 按钮切换区域 -->
        <nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-cust" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-cust" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-cust" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span class="mui-badge" id="badge-shopcar">{{ this.$store.getters.getTotalCount }}</span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-cust" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
    </div>    
</template>

<script>
export default {
    data() {
        return {
            flag: false
        }
    },
    created() {
        // 创建的时候，需要判断下当前路由的位置
        // 防止刷新页面后，返回按钮消失（因为默认flag值为false，刷新后，并不能第一时间监测到路由变化）
        this.flag = this.$route.path === '/home' ? false: true;
    },
    methods: {
        back() {
            this.$router.go(-1);
        }
    },
    watch: {
        "$route.path": function(newVal, oldVal) {
            if (newVal === '/home') {
                this.flag = false;
            }
            else {
                this.flag = true;
            }
        }
    },
}
</script>

<style lang="scss" scoped>
    .app_container {
        padding-top: 40px;
        padding-bottom: 50px;
        overflow-x: hidden;
    }

    .v-enter {
        opacity: 0;
        transform: translateX(100%);
    }

    .v-leave-to {
        opacity: 0;
        transform: translateX(0);
        position: absolute;
    }

    .v-enter-active,
    .v-leave-active {
        transition: all 0.5s ease;
    }
    
    .mint-header {
        z-index: 99;
    }

    
.mui-bar-tab .mui-tab-item-cust.mui-active {
    color: #007aff;
}

.mui-bar-tab .mui-tab-item-cust {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}

.mui-bar-tab .mui-tab-item-cust .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}

.mui-bar-tab .mui-tab-item-cust .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}
</style>
